As a species we’ve been getting larger and obesity is at epidemic proportions in some Western societies. So why are we doing so much damage to ourselves, our health services and our planet? Is it mainly due to nurture, the environment? Or is it more to do with nature, our biology? In Rethinking Obesity, featuring contributions from Dr. Clare Llewellyn and Dr. Giles Yeo, we consider the evidence for nurture vs. nature.